Graphene/aramid fiber coated membrane for lithium ion battery, and preparation method of graphene/aramid fiber coated membrane

A graphene/aramid fiber coated membrane for a lithium ion battery comprises a base membrane; a graphene/aramid fiber composite coating is arranged on at least one surface of the base membrane; and thegraphene/aramid fiber composite coating is prepared from the aramid fiber, a solvent, a cosolvent, adhesive, a pore-forming agent and graphene. The modified membrane has the advantages of high heat stability, high interface stability, high mechanical strength, high wettability, high liquid-absorbing and liquid-retaining rate, high ionic conductivity and the like, and can improve the safety performance, the cyclic stability and the rate capability of the lithium ion battery. 种锂电池用石墨烯/芳纶混合涂覆隔膜，包括基膜，所述基膜的至少个表面设置石墨烯/芳纶复合涂层，所述石墨烯/芳纶复合涂层由芳纶、溶剂、助溶剂、粘结剂、造孔剂及石墨烯制成。本发明的改性隔膜具有热稳定性好、界面稳定性好、机械强度高、浸润性好、吸液保液率高、离子导电性好等优点，可以提高锂离子电池的安全性能、循环稳定性能和倍率性能。